Aluminum salts of gluconic acid



PatentedFehtZS, or A v p v i I I UNITED STATE$ ;PAT

WALTER KUSSMAUL, onnasnn; swrrz nnnannnssrenon.rocnnrlrrclrn WORKS FORMERLY sannoz on Basset, SWITZERLAND. i

ALUMINIUM sALTs IGL'UQONIC-K Amen j p I No Drawing. Application filed. January 31, 1930, Serial No: 125,060, and"ing Ger nanyjiFebruar v The present invention relates to the prep- Thenewaluminum cemp' undsmy be ad aration of aluminum salts of gluconic acid vantageouslyfemployed ffor"pharmaceutical which have hitherto never been prepared and andotherjcheliiical -purp-oses. which possess very valuable properties. The following examples illustratethe in- 5 Some of the aluminum compounds used in vention. I r r 55 the therapyare not stable enough in aqueous solutionor are not obtainable in a solid form t V 7 without partial loss of the primordial solu- To 1 molecule of aluminum sulphate disbility, as for instance in the case of aluminum solved in hot water a warm saturated solu- .Emample 1 these diiiicultiesby suitable additions which added. By further boiling the precipitation* are broadly described in the literature (Ullof calcium sulphate is completed and then the V mann; Enzyklopadie der Technischen Chefiltered solution is evaporated preferably in mie, Tome V, page 12); vacuo. The resulting dry product forms in 15 It hasnow been found that the hitherto pulverized state a white powder easily 80111 65 unknown non-hygroscopic aluminum salts of ble' in wate'nyielding stable solutions. It gluconic acid form stable solutions and conpossesses probably the following formula serve even after drying the property of. a Al(C H O and contains 4.42% Al. perfect solubility in water yielding clear and v stable solutions. I These solutions possess an acid reaction which maybe neutralized without any precipitation occurring. Even when made alka-' line with ammonia; they remain perfectly clear, the aluminum compounds being not hydrolyzed. They also may be heated for a long time without becoming gelatinous like the solutions of aluminum acetate. These properties show the difference between they hitherto unknown aluminum compounds of Example? 7 .1270

6,6 parts of crystallized aluminum sulphate dissolved. in hot water are treated with a saturated hot aqueous solution of 5,7 parts of barium gluconate and thereupon a saturated solution of 7 parts of crystallized bari um hydroxide s further added. After separation of the obtained barium sulphate the solution is'concentrated in-vacuo-and the aluminum compound precipitated bymeans of methyl alcohol in form of a white poiivder-f gluconic acid and t of the l i? a s which is, when dried easily soluble in water, generally used 9 pharmacetltlcal P yielding stable solutions and containing 11,9

The new aluminum der1vat1ves of gluconic cent of aluminum; Its probable formula acid are preferably prepared by double de the f ll i composition of suitable aluminum salts, for 1 V OH t o .3 example aluminum sulphate, with gluconic v -AIC0H11O1 acid salts, for instance bariumv gluconate, v 7 H eventually in presence of hydroxides of earth 40 alkali metals. The precipitate of theearth r V V v p i alkali metal Sulphate is first Separated a To a hot saturatedsolution of commercial the remaining sol ti n o a min g sodium'a'luminate there is added an 80 per onate evaporated todryness orpreci'pitatedl ent aqueous solution of free gluconic acid by means of alcohol. until the strong alkaline reaction has disap- Eaamzple 3 Neutral aluminum compounds 0f gl on "peared and the. solution reacts slightly acid.

acid may be prepared by treatinganaqueous The. clear solution thus obtained is treated alkali aluminate solution with gluconio aoid "with methyl alcohol and the precipitated com- I or by neutralizing the above described alumi pound filtered, washed with methyl alcohol num gluconate by a suitable quantity of an and dried; In dry state it constltutes a white acetate. It has often been tried to overcome tion of 3 molecules of calcium gluconate is -co alkali, V voluminous powder which; contains 7,2 er ;10f

cent aluminum and 6,8 per cent sodium. It possesses the probable formula: r

can be obtained by the ihteraction of aluminum salts with gluconic acid and its salts and Which-2am :the. airy tstatei nonhygnoscopic H white powders, easily. sdl11'ble.in-'Water. with a slight acid reaction, yielding stable solutions which can be neutralized with alkali findeven bemade alkaline with ammonia without anyfprecipitation occurring.

In witness whereof leha ce-he 'eunto signed i I "y oflannany, .1930. 

